What is the SI unit of force?

The SI unit of force is known as the newton. A newton is defined as the amount of force required to accelerate a one-kilogram mass by one meter per second squared. This unit is part of the International System of Units (SI), which standardizes measurements across various scientific disciplines. Understanding the newton is crucial, as it relates to Newton's second law of motion, which states that force is equal to mass times acceleration (F = ma).

In contrast, grams measure mass, while pascals measure pressure (force applied over an area), and joules measure energy or work done. Thus, the newton specifically quantifies force, making it the correct answer.